South Texas Weather

Chilling Units Calculator


Stone and pome fruit trees rely on enough chilling for flowers and leaf buds to develop normally.
If the buds do not receive sufficient chilling temperatures during winter to completely release dormancy,
trees may develop physiological symptoms such as delayed and extended bloom, delayed foliation, reduced fruit set and reduced fruit quality.

Chilling Units are calculated using hourly average temperatures from our weather stations and standard temperature thresholds.

1 hour below 34°F = 0.0 chill unit

1 hour 34.01 - 36°F = 0.5 chill unit

1 hour 36.01 - 45°F = 1.0 chill unit

1 hour above 45°F = 0.0 chill units

Select a Station:
Begin Calculation from:mm/dd/yyyy
End Calculation on: mm/dd/yyyy

Freezing Hours Calculator


Freezing occurs when the average temperature for a given hour is below 32° Fahrenheit.
Here, we provide an easy to use application to query the weather station data for any freezing hours.

Select a Station:

Begin Calculation from:mm/dd/yyyy
End Calculation on: mm/dd/yyyy

Citrus Freezing Hours Calculator


Freezing in citrus crops occurs when the average temperature for a given hour is below 26° Fahrenheit.
Here, we provide an easy to use application to query the weather station data for any freezing hours.

Select a Station:
Begin Calculation from:mm/dd/yyyy
End Calculation on: mm/dd/yyyy

Howdy!

This site is run by the Texas A&M AgriLife Research Center District 12 Office. Our aim is to provide the public with weather data recorded from our weather stations placed around the Rio Grande Valley.

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Texas A&M AgriLife
Research | 2415 E Hwy 83 | Weslaco, TX 78596
Phone: (956)968-5585 | Fax: (956)969-5620